Prediction of Joint Durability between Adhesive Resin Cement and Dental Alloy.

在工业领域，R. A. Glendhill等人（J.Adhesion，1980，vol.11，p3-15）开发了一种用于预测接头耐久性的方法，该方法仅需要关于粘合剂中的扩散系数和平衡吸水率以及短期机械性能的信息。本研究的目的是确定是否有可能使用这种分析来预测拉伸对接接头的接头耐久性，该接头由牙科用12% Au-Ag-Pd合金与商业4-Meta牙科粘合树脂水门汀结合组成，50 ℃和60 ℃在树脂水泥和合金之间的界面处渗透的水的量由用于吸水的Fick方程计算，以及水泥中的扩散系数和平衡吸水率。根据ASTM标准获得应力强度因子，并且还测定了在60 ° C的水中浸泡三天的拉伸粘合强度。使用这些值和水浓度分布，然后推导出作为测试前的温度和浸泡时间的函数的接头的断裂应力值。为了确保接头耐久性的预测是适当的，将理论预测值与60 ° C下实验测定的强度值进行比较。预测值与实验测量值之间的一致性良好。

In industrial field, R.A.Glendhill et al. (J.Adhesion, 1980, vol.11, p3-15) developed a method for predicting the joint durability which only required the information about the diffusion coefficient and equilibrium water uptake in adhesives and the short-term mechanical properties. The object of this study is to determine whether it is possible to use this analysis for predicting the joint durability of tensile butt joints, consisting of a dental 12% Au-Ag-Pd alloy bonded with a commercial 4-META dental adhesive resin cement immersed in water at 20ﾟ,37ﾟ,50ﾟ and 60ﾟCThe amount of water penetrated at the interface between the resin cement and the alloy was calculated from the Fick's equation for water absorption, and the diffusion coefficient and equilibrium water uptake in the cement. The stress-intensity factor was obtained according to the ASTM standard, and the tensile adhesive strength immersed in water at 60ﾟC for three days was also determined. Using these values and the water concentration profile, values of joint's fracture stress were then deduced as a function of the temperature and immersion time prior to testing. To make sure that the prediction of the joint durability is appropriate, the theoretically predicted values were compared to the experimentally determined strength values at 60ﾟC.The agreement between the prediction and experimental measurements was good.